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Overview of Tag Data Links Section 6-1
6-1 Overview of Tag Data Links
6-1-1 Tag Data Links
Tag data links enable cyclic data exchanges on an EtherNet/IP network
between PLCs or between PLCs and another device. I/O memory addresses
(e.g., in the CIO or DM Area) and symbols can be assigned to tags. The set-
tings for tag data links are made using the Network Configurator. Refer to 6-2
Setting Tag Data Links for information on how to make the settings.
Note Symbols can be used in tags only for the CJ2H-CPU6@-EIP and CJ2M-
CPU3@. If you are using a CJ1W-EIP21 or CS1W-EIP21 EtherNet/IP Unit that
is mounted to a CJ2H-CPU6@ or any CPU Unit other than the CJ2H-CPU6@-
EIP, use I/O memory addresses to set the tag data links.
With tag data links, one node requests the opening of a communications line
called a connection to exchange data with another node. The node that
requests opening the connection is called the originator, and the node that
receives the request is called the target.
For communications between PLCs, the connection information is set in the
EtherNet/IP Unit or built-in EtherNet/IP port of the PLC that receives data (i.e.,
the originator).
Note The specifications for using tag data links with the CJ2M built-in EtherNet/IP
port on a CJ2M-CPU3@ CPU Unit are different from the specifications for Eth-
erNet/IP Units (CJ1W-EIP21 or CS1W-EIP21) and the CJ2H built-in EtherNet/
IP port on a CJ2H-CPU@@-EIP CPU Unit. Make sure you are using the cor-
rect specifications for the application.
Refer to 2-1-3 Communications Specifications for the communications specifi-
cations.
6-1-2 Overview of Operation
Setting and Downloading Tag Data Link Parameters
The tag data link parameters (e.g., connection information) that are described
below are created using the Network Configurator, and then the parameters
are downloaded to all originator devices on the EtherNet/IP network.
Input tags
Output tags
Input tags
Output tags
DM00100
Var-In
DM20000
DM00200
Var-Out
DM20100
Var-Out1
Var-Out2
Var-Out3
DM00200
WR300
DM20100
I/O refreshed.
Inputs
Tag set name: ABC
CPU Unit CPU Unit
I/O refreshed.
I/O refreshed.
I/O refreshed.
EtherNet/IP Unit
EtherNet/IP Unit
Originator
Originator
Outputs
Tag set name: XYZ
PLC status
PLC status
Connection
Connection
Tag set name: OUT1
Outputs
Target
Target
Inputs
Tag set name: IN1
Ethernet (EtherNet/IP)
Var-Out1(DM0)
Var-Out2(DM100)
Var-Out3(DM200)
DM00200
WR300
DM20100
DM00100
Var-In(WR200)
DM20000
DM00200
Var-Out(WR300)
DM20100
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